CN113757568A - Direct insertion type pipeline fluid detection device and detection method thereof - Google Patents

Abstract

The invention discloses a direct insertion type pipeline fluid detection device and a detection method thereof, and belongs to the field of industrial fluid online measurement. The detection device comprises an in-line sensor and a fluid cavity, wherein the fluid cavity is arranged at the front end of the in-line sensor, the length of the fluid cavity extends to a position which is not smaller than that of a detection component of the in-line sensor, the fluid cavity is positioned on the outer side of the detection component, and a channel for fluid to flow through is arranged in the fluid cavity. The invention overcomes the current situations of insufficient detection accuracy and inconvenient installation and application of the direct-insertion type fluid sensor in the prior art, and improves the measurement accuracy of the sensor by forming the pipeline detection pool in the pipeline and changing the fluid characteristics near the sensor, such as flow speed, flow direction, liquid level height and the like.

Description

Direct insertion type pipeline fluid detection device and detection method thereof

Technical Field

The invention relates to the technical field of industrial fluid online measurement, in particular to a direct-insertion type pipeline fluid detection device and a detection method thereof, which can be directly installed on a pipeline and change the flow field characteristics near a sensor.

Background

The development of industrial informatization has led to the need for a large number of on-line monitoring techniques and products for on-line parameter measurement of industrial fluids such as lubricating oils, chemical raw materials, etc. which are now in widespread use. The sensor for on-line measurement of industrial fluid mainly adopts two installation modes of pipeline direct insertion and bypass, wherein the direct insertion installation mode is generally accepted by users due to low cost and less equipment modification workload.

However, the direct-insertion type sensor which is generally adopted in the industry at present has the following problems in the installation mode in practical application: (1) the flow velocity of fluid in the pipeline and other factors have great influence on the measurement accuracy, and the measurement error of the sensor is increased because the flow parameters of the fluid in the pipeline cannot be known before the sensor is installed; (2) the punching workload is large, and the punching position and the punching angle cannot be adjusted at will after being determined. If the sensor is installed and the fluid level is found to be too low, the sensor can only be installed by punching, which causes the production line to be shut down and is high in cost. The mode of installing the sensor at the bottom of the pipeline can partially improve the problems, but brings a new problem that the sensor is not easy to assemble, disassemble and maintain. Therefore, there is a need for a direct insertion type pipeline detection device which can adapt to all different flow field characteristics.

At present, the detection application of pipeline fluid is mature, and abundant related patent technologies appear, such as chinese patent application No.: 2014204517845, the name of invention creation is: the pipeline fluid monitor comprises a shell, a controller arranged in the shell, a sensor for detection, a sonar sensor and a sonar sensor, wherein the sensor for detection is respectively electrically connected with the controller; the sonar transmitting and receiving parts of the two sonar sensors are arranged in an opposite way. This application avoids the effects of various external environments by using sonar sensors to transmit data, and is also installed by insertion in a drillable form into the pipeline, but also faces the drawbacks of the above-mentioned applications.

Disclosure of Invention

1. Technical problem to be solved by the invention

The invention aims to overcome the current situations that the direct-insert type fluid sensor in the prior art has insufficient detection accuracy and is inconvenient to install and apply, and provides a direct-insert type pipeline fluid detection device and a detection method thereof.A pipeline detection pool is formed in a pipeline, so that the fluid characteristics such as flow speed, flow direction, liquid level height and the like near the sensor are changed, the measurement accuracy of the sensor is improved, the corresponding setting can be modified according to the actual pipeline size and the fluid characteristics, so that pipeline detection pools with different effects are obtained, and a better fluid environment is provided for the normal measurement of the sensor; secondly, the device can be conveniently inserted into and taken out from the mounting hole of the pipeline, is convenient to use, and effectively reduces the punching workload.

2. Technical scheme

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

the invention discloses a direct-insert type pipeline fluid detection device which comprises a direct-insert type sensor and a fluid cavity, wherein the fluid cavity is arranged at the front end of the direct-insert type sensor, the length of the fluid cavity extends to a position which is not smaller than that of a detection component of the direct-insert type sensor, the fluid cavity is positioned on the outer side of the detection component, and a channel for flowing fluid is arranged in the fluid cavity.

Further, the in-line sensor includes a detection member, a screw member, a cylinder member and a pressing table in this order from a front end portion contacting a fluid to be measured, wherein a seal ring is installed between the cylinder member and the pressing table, and diameters of the respective portions increase in this order from front to back.

Furthermore, the fluid cavity comprises a connecting body and a fixed flow baffle plate; the connector is used for being connected with the cooperation installation of formula sensor that cut straightly, and fixed fender flows board and connector edge connection downwardly extending, and extension length is no less than the detection part position that cut straightly the formula sensor.

Furthermore, the device also comprises a movable flow baffle which is arranged on the fluid cavity and distributed around the detection component of the direct-insert type sensor, the movable flow baffle has an opening state and a closing state, and the switching of the two states is realized by the vertical movement of the direct-insert type sensor in the pipeline; when in use, the included angle between at least one group of flow baffle plates and the direction of the fluid in the pipeline is not 0.

Furthermore, the movable flow baffle is arranged on the fixed flow baffle in a rotating fit mode, the movable flow baffle and the fixed flow baffle form included angles theta 1 and theta 2 respectively when the movable flow baffle is in a closed state and an opened state, the theta 1 is smaller than the theta 2, and the corresponding flow blocking cross-sectional area of the theta 2 in the opened state is larger than that of the theta 1.

Furthermore, the movable flow baffle is hinged on at least one side of the fixed flow baffle through a rotating shaft, the movable flow baffle and the fixed flow baffle are arranged in parallel in a stacking mode and can rotate around the rotating shaft and realize relative opening or closing, and when the movable flow baffle gradually contacts the inner wall of the pipeline, the movable flow baffle gradually opens towards the side; when the movable baffle plate is separated from the inner wall of the pipeline, the movable baffle plate gradually droops and closes due to self weight, and the included angle between the movable baffle plate and the fixed baffle plate is gradually reduced.

Furthermore, the movable flow baffle is arranged on at least one side of the fixed flow baffle through a hinge and can rotate around the fixed flow baffle in an opening and closing manner, and the maximum rotation angle of the hinge does not exceed 180 degrees.

Furthermore, the front end of the movable flow baffle is also provided with a control mechanism, the control mechanism contacts the inner wall of the pipeline before the movable flow baffle, and the control mechanism can be opened under the contact force action of the inner wall of the pipeline and can be closed under the action of gravity or elasticity when being separated from the inner wall of the pipeline, so that the opening or closing state switching of the movable flow baffle is driven.

Furthermore, the control mechanism comprises a double-arm structure or a V-shaped spring wire which are connected through a hinge, the movable flow blocking plates are respectively and symmetrically arranged on two sides of the fixed flow blocking plate, and two ends of the control mechanism are correspondingly connected to the movable flow blocking plates on the two sides.

The invention discloses a direct insertion type pipeline fluid detection method, which utilizes the detection device to detect, and comprises the following processes:

s1, rotating the movable flow baffle or the control mechanism of the direct-insertion sensor inwards to make the movable flow baffle in a closed state relative to the fixed flow baffle;

s2, the direct insertion type sensor is downwards installed into the pipeline from the installation hole on the pipeline, and the movable flow baffle is parallel to the axial direction of the pipeline;

s3, continuously moving the direct insertion type sensor downwards to enable the lower end of the movable flow baffle or the control mechanism to be in contact with the inner wall of the pipeline;

s4, after the lower end of the movable flow baffle or the control mechanism contacts the inner wall of the pipeline, continuously applying a pushing force downwards to open the movable flow baffle;

s5, rotating the direct-insert type sensor to enable the movable flow baffle to be vertical to the axis direction of the pipeline, and screwing the direct-insert type sensor to be installed on the pipeline to form a pipeline detection pool;

s6, after the detection is finished, the direct insertion type sensor is moved upwards, the movable flow baffle is gradually closed under the action of gravity or a control mechanism, the direct insertion type sensor is continuously lifted upwards, and when the movable flow baffle contacts the edge of the mounting hole in the pipeline, the movable flow baffle is completely closed and can be smoothly taken out of the pipeline mounting hole;

or:

when the direct-insert type sensor is only provided with the fixed flow baffle plate, the direct-insert type sensor is installed to enable the fixed flow baffle plate to be vertical to the axis direction of the pipeline, and the direct-insert type sensor is screwed down to be installed on the pipeline, so that the pipeline detection pool is formed; after the detection is finished, the direct-insertion type sensor is moved upwards and taken out.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:

(1) at present, sensors are often installed on industrial pipelines through punching holes, the positions, the number and the sizes of installation holes have strict requirements, and too many installation holes and too large installation holes influence the strength of the pipelines and threaten the production safety; in practical application, because the fluid parameters in the pipeline, such as liquid level height or flow rate, are not clear during punching, the sensor can not work due to too low liquid level after being installed, so that the punching is needed again, the cost is increased, and hidden dangers are brought to the pipeline safety.

(2) The detection device provided by the invention adopts the design of the flow baffle, so that the sensor provided with the fluid cavity can smoothly enter the pipeline through the mounting hole with a smaller size, and a flow baffle surface with a larger area is formed in front of and behind the sensor, thereby changing the fluid environment measured by the sensor and improving the measurement effect.

(3) The direct-insertion type pipeline fluid detection device is simple in overall structure design, convenient to apply, high in reliability and convenient to mount and dismount from the upper part of a pipeline.

Drawings

FIG. 1 is a schematic diagram of an application state structure of an in-line pipeline fluid detection device of the invention;

FIG. 2 is a schematic diagram of the external structure of the detecting device of the present invention;

FIG. 3 is a schematic side view of a fluid chamber according to the present invention;

FIG. 4 is a schematic view of a parallel rotating fluid chamber according to the present invention;

FIG. 5 is a schematic structural view of an open-close fluid chamber according to the present invention;

FIG. 6 is a schematic top view of an open-close fluid chamber according to the present invention;

fig. 7 is a schematic view of a fluid chamber with a control mechanism according to the present invention.

The reference numerals in the schematic drawings illustrate:

100. an in-line sensor; 200. a fluid chamber; 300. a movable flow baffle; 400. a pipeline; 500. a control mechanism; 101. a detection section; 102. a threaded member; 103. a cylindrical member; 104. pressing the table; 105. a seal ring; 201. a linker; 202. fixing a flow baffle; 203. a threaded hole; 301. a rotating shaft; 302. and (4) a hinge.

Detailed Description

For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The present invention will be further described with reference to the following examples.

Example 1

As shown in fig. 1 to 4, an in-line type pipeline fluid detection device of the present embodiment includes an in-line sensor 100 and a fluid chamber 200, where the fluid chamber 200 is installed at a front end of the in-line sensor 100, and has a length not less than a position where a detection component 101 of the in-line sensor 100 is located, the fluid chamber 200 is located outside the detection component 101, and a channel for fluid to flow through is disposed in the fluid chamber 200.

The in-line sensor 100 in this embodiment may be a sensor for measuring parameters such as fluid viscosity and particles, and may be applied according to actual detection requirements, and the specific selection and application of the sensor, and the installation and fixation between the sensor and the pipeline 400 during use all belong to the prior art in the industry, and are not described herein again.

Specifically, as shown in fig. 2, the in-line sensor 100 includes a detection member 101, a screw member 102, a cylindrical member 103, and a pressure table 104 in this order from the front end portion contacting the fluid to be measured, wherein a seal ring 105 is installed between the cylindrical member 103 and the pressure table 104, and the diameters of the respective portions increase in this order from the front to the rear. As shown in fig. 3, the fluid chamber 200 includes a connecting body 201 and a fixed baffle 202; the connecting body 201 is used for being installed and connected with the in-line sensor 100 in a matched mode, specifically, a threaded hole 203 is formed in the middle of the connecting body 201 and used for being installed and connected with a threaded component 102 on the in-line sensor 100 in a matched mode, the fixed flow blocking plate 202 is rigidly connected with the edge of the connecting body 201 and extends downwards, the fixed flow blocking plate 202 can be arranged in the front and back position of the detecting component 101, and the extending length is not less than the position of the detecting component 101 of the in-line sensor 100.

In this embodiment, the connecting body 201 may be a square column or a cylinder, and the fixed flow baffle 202 may also be a flat plate or an arc panel, and when the fluid level in the pipeline 400 is still high and the flow speed is high in practical applications, the fixed flow baffle 202 is directly abutted against the inner wall of the pipeline 400, so that the detecting component 101 of the in-line sensor 100 is completely immersed in the fluid, and the included angle between at least one fixed flow baffle 202 and the fluid flow direction is not 0, and the fixed flow baffle 202 can play a role in changing the flow field characteristics near the sensor, so as to change the fluid characteristics near the detecting component 101, such as the flow speed, the flow direction, or the liquid level height, and the like, and fully guarantee the detection accuracy of the detecting component 101.

Example 2

The basic structure of the in-line pipeline fluid detection device of this embodiment is the same as that of embodiment 1, and further, in this embodiment, on the basis of the fixed flow baffle 202, a movable flow baffle 300 is further provided, the movable flow baffle 300 is mounted on the fluid cavity 200 and distributed around the detection component 101 of the in-line sensor 100, the movable flow baffle 300 has an open state and a closed state, and the two states are switched by the up-and-down movement of the in-line sensor 100 in the pipeline 400; similarly, when in use, the angle between the at least one set of movable baffles 300 and the fluid in the pipeline 400 is not 0.

In this embodiment, the movable flow baffle 300 is rotatably installed on the fixed flow baffle 202 in a matching manner, the movable flow baffle 300 has included angles θ 1 and θ 2 with the fixed flow baffle 202 in the closed state and the open state, wherein the included angle θ 1 corresponds to an included angle between the movable flow baffle 300 and the fixed flow baffle 202 in the closed state when the fluid cavity 200 enters or exits the installation hole of the pipeline 400, as shown in fig. 4, the included angle θ 2 corresponds to an included angle between the movable flow baffle 300 and the fixed flow baffle 202 in the open state when the in-line sensor 100 works in the pipeline 400, as shown in fig. 1, and θ 1 is less than θ 2, and the flow-blocking cross-sectional area corresponding to the opened state of θ 2 is greater than the flow-blocking cross-sectional area corresponding to θ 1.

Specifically, as shown in fig. 1, the movable flow baffle 300 is hinged to at least one side of the fixed flow baffle 202 through a rotating shaft 301, in this embodiment, the movable flow baffle 300 can be disposed on both sides; the rotating shaft 301 is vertically installed on the fixed flow baffle 202, the movable flow baffle 300 and the fixed flow baffle 202 are installed in a stacked parallel manner, can rotate around the rotating shaft 301 and realize relative opening or closing, and gradually open to the side when the movable flow baffle 300 gradually contacts the inner wall of the pipeline 400; when the movable baffle 300 is separated from the inner wall of the pipe 400, it gradually hangs down and closes due to its own weight, and the included angle between the movable baffle and the fixed baffle 202 is gradually reduced.

In this embodiment, the movable flow baffle 300 may be a straight-ridge blade-shaped structure with one edge being a curved shape similar to the curvature of the inner wall of the pipeline 400, so that the flow-blocking cross-sectional area can be effectively increased in an open state, and the bottom of the movable flow baffle 300 is not completely attached to the inner wall of the pipeline 400, so that a certain gap can be reserved for smooth passage of some impurities and other substances in the fluid; the rotating shaft 301 is installed at the edge of the center line of the movable baffle 300 far from the curved edge, and the angle of the movable baffle 300 relative to the curved edge is cut off, so that the center of gravity coincides with the center line or is located in the half-edge area without the cut angle, thereby facilitating the subsequent inward sagging and closing under the action of self-weight. That is, when the movable flow baffle 300 is freely suspended on the fixed flow baffle 202 through the rotation shaft 301, the movable flow baffle 300 and the fixed flow baffle 202 may completely overlap, and the included angle θ 1 therebetween is 0 °, as shown in fig. 4.

As shown in fig. 1, when the in-line sensor 100 moves downward in the pipe 400, the movable baffle 300 rotates in both directions by the thrust of the rotary shaft 301 and the resistance of the inner wall of the pipe 400. When the lower end of the fixed flow baffle 202 contacts the inner wall of the pipeline 400, the movable flow baffle 300 is completely opened towards both sides, and the included angle between the movable flow baffle 300 and the fixed flow baffle 202 is theta 2-90 degrees, at which time the fluid chamber 200 stops moving. Similarly, in practice, the shape of the movable flow baffle 300 may adopt various designs, and the requirements of the flow baffle cross-sectional area and the sagging closed state can be effectively met, which is not limited or described herein.

Example 3

The basic structure of an in-line pipeline fluid detection apparatus of this embodiment is the same as that of embodiment 2, except that in this embodiment, as shown in fig. 5, the movable flow baffle 300 is installed on at least one side of the fixed flow baffle 202 through a hinge 302, specifically, the movable flow baffle 300 is installed on both side edges of the fixed flow baffle 202, the movable flow baffle 300 can rotate around the fixed flow baffle 202 in an opening and closing manner, and the maximum rotation angle of the hinge 302 does not exceed 180 °.

In this embodiment, when the movable flow baffle 300 is closed, the angle θ 1 between the movable flow baffle 300 and the fixed flow baffle 202 is 0 ° in the optimal state, and at this time, the detection device can be installed through the installation hole of the pipe 400, and when the movable flow baffle 300 is opened, the angle θ 2 between the movable flow baffle 300 and the fixed flow baffle 202 is 90 °. Similarly, the lower wall of the movable baffle 202 may also be curved similar to the curvature of the inner wall of the pipeline 400, and a gap is not completely formed between the lower wall and the inner wall.

Example 4

The basic structure of the direct insertion type pipeline fluid detection device of this embodiment is the same as that of the above embodiment, and further, the front end of the movable flow baffle 300 is further provided with a control mechanism 500, the control mechanism 500 contacts the inner wall of the pipeline 400 before the movable flow baffle 300 contacts the inner wall of the pipeline 400, and the control mechanism 500 can be opened under the contact force of the inner wall of the pipeline 400 and can be closed under the action of gravity or elasticity when being separated from the inner wall of the pipeline 400, thereby driving the movable flow baffle 300 to be switched between the open state and the closed state.

In this embodiment, the control mechanism 500 includes a double-arm structure or a V-shaped spring wire connected by a hinge, the movable flow blocking plates 300 are respectively and symmetrically disposed on two sides of the fixed flow blocking plate 202, and two ends of the control mechanism 500 are correspondingly connected to the movable flow blocking plates 300 on the two sides.

As shown in fig. 7, the movable flow baffle 300 is disposed on both sides of the fixed flow baffle 202, the control mechanism 500 is a two-arm structure connected by a hinge, and two ends of the two-arm structure are connected to the ends of the movable flow baffle 300 by a rotating shaft to form a movable parallelogram. When the angle between the movable flow baffle 300 and the fixed flow baffle 202 is 0, the angle between the two arms is the smallest, and the in-line sensor 100 can enter the inside of the pipe through the installation hole on the pipe 400. When the in-line sensor 100 moves downward in the pipe 400, the hinge connection part of the double-arm structure first contacts the inner wall of the bottom of the pipe 400, the parallelogram formed by the double-arm structure and the movable flow baffle 300 deforms under the blocking of the inner wall of the pipe 400, the included angle between the double arms increases until the lower edge of the fixed flow baffle 202 contacts the inner wall of the pipe 400, and at this time, the included angle between the double arms is the largest, and the movable flow baffle 300 is in a fully open state. When the direct-insert sensor 100 needs to be taken out, the sensor is moved upwards, the parallelogram formed by the double-arm structure and the movable flow baffle 300 is deformed under the action of gravity, the included angle between the double arms is reduced, and then the movable flow baffle 300 is driven to be closed.

The method for detecting the fluid in the straight-insertion pipeline in the embodiment utilizes the detection device in the embodiment to detect, and comprises the following steps of:

when only the fixed baffle plate 202 is provided, the in-line sensor 100 is installed into the pipe 400 from the installation hole on the pipe 400 downward, and the fixed baffle plate 202 is perpendicular to the axial direction of the pipe 400; continuing to move the direct-insert sensor 100 downwards to enable the lower end of the fixed flow baffle 202 to be in contact with the inner wall of the pipeline 400, and screwing a locking nut on the direct-insert sensor 100 to enable the direct-insert sensor 100 to be installed on the pipeline 400, so that a pipeline detection pool is formed; after the detection is finished, the locking nut is loosened, the direct-insertion sensor 100 is moved upwards, and then the sensor is taken out.

When the movable flow baffle 300 or the control mechanism 500 is provided, the movable flow baffle 300 is initially in a closed state, for example, an angle θ 1 between the movable flow baffle 300 and the fixed flow baffle 202 is 0 ° in an optimal state;

the in-line sensor 100 is installed into the pipeline 400 from the installation hole on the pipeline 400 downward, and the movable baffle plate 300 is parallel to the axial direction of the pipeline 400;

continuing to move the in-line sensor 100 downwards so that the lower end of the movable flow baffle 300 or the control mechanism 500 is in contact with the inner wall of the pipeline 400;

continuously applying a downward thrust force to open the movable flow baffle 300 by rotation under the resistance of the inner wall of the pipeline 400 or by the control mechanism 500, so that the included angle θ 2 between the movable flow baffle 300 and the fixed flow baffle 202 is 90 °; then the direct-insertion sensor 100 is rotated, specifically, the direct-insertion sensor 100 can be rotated by 90 degrees, so that the movable flow baffle 300 is perpendicular to the axial direction of the pipeline 400, and the direct-insertion sensor 100 is screwed down and installed on the pipeline 400, so that a pipeline detection pool is formed;

after the detection is finished, when the in-line sensor 100 needs to be taken out of the pipeline 400, the in-line sensor 100 is moved upwards, the movable flow baffle 300 is gradually closed under the action of gravity or the control mechanism 500, the in-line sensor 100 is continuously lifted upwards, and when the movable flow baffle 300 contacts the edge of the mounting hole on the pipeline 400, the movable flow baffle 300 is completely closed by being pressed by the inner wall of the mounting hole of the pipeline 400, and can be smoothly taken out of the mounting hole of the pipeline 400.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.

Claims (10)

1. An in-line pipeline fluid detection device which characterized in that: the sensor comprises an in-line sensor (100) and a fluid cavity (200), wherein the fluid cavity (200) is installed at the front end of the in-line sensor (100), the length of the fluid cavity extends to the position of a detection part (101) which is not smaller than the in-line sensor (100), the fluid cavity (200) is located on the outer side of the detection part (101), and a channel for fluid to flow through is formed in the fluid cavity (200).

2. An in-line pipeline fluid testing device according to claim 1, wherein: the direct-insertion type sensor (100) sequentially comprises a detection component (101), a thread component (102), a cylinder component (103) and a pressing platform (104) from the front end part contacting with a measured fluid to the back, wherein a sealing ring (105) is arranged between the cylinder component (103) and the pressing platform (104), and the diameters of all parts are sequentially increased from front to back.

3. An in-line pipeline fluid testing device according to claim 1, wherein: the fluid cavity (200) comprises a connecting body (201) and a fixed flow baffle plate (202); the connecting body (201) is used for being matched, installed and connected with the direct-insert type sensor (100), the fixed flow baffle (202) is connected with the edge of the connecting body (201) and extends downwards, and the extending length is not less than the position of the detection component (101) of the direct-insert type sensor (100).

4. An in-line pipe fluid testing device according to any of claims 1-3, wherein: the fluid cavity is characterized by further comprising a movable flow baffle (300), the movable flow baffle (300) is mounted on the fluid cavity (200) and distributed around the detection component (101) of the direct-insertion type sensor (100), the movable flow baffle (300) has an opening state and a closing state, and the two states are switched by the up-and-down movement of the direct-insertion type sensor (100) in the pipeline (400); when in use, the included angle between at least one group of flow baffle plates and the direction of the fluid in the pipeline (400) is not 0.

5. An in-line pipeline fluid testing device according to claim 4, wherein: the movable flow baffle (300) is arranged on the fixed flow baffle (202) in a rotating fit mode, the movable flow baffle (300) and the fixed flow baffle (202) respectively form included angles theta 1 and theta 2 when being in a closed state and an open state, the theta 1 is smaller than the theta 2, and the corresponding flow blocking cross-sectional area is larger than that of the theta 1 when the theta 2 is in the open state.

6. An in-line pipeline fluid testing device according to claim 5, wherein: the movable flow baffle (300) is hinged to at least one side of the fixed flow baffle (202) through a rotating shaft (301), the movable flow baffle (300) and the fixed flow baffle (202) are arranged in parallel in a stacked mode, can rotate around the rotating shaft (301) and realize relative opening or closing, and gradually opens towards the side when the movable flow baffle (300) gradually contacts the inner wall of the pipeline (400); when the movable flow baffle (300) is separated from the inner wall of the pipeline (400), the movable flow baffle gradually droops and closes due to self weight, and the included angle between the movable flow baffle and the fixed flow baffle (202) is gradually reduced.

7. An in-line pipeline fluid testing device according to claim 5, wherein: the movable flow baffle (300) is arranged on at least one side of the fixed flow baffle (202) through a hinge (302) and can rotate around the fixed flow baffle (202) in an opening and closing mode, and the maximum rotation angle of the hinge (302) is not more than 180 degrees.

8. An in-line pipeline fluid testing device according to claim 6 or 7, wherein: the front end of the movable flow baffle (300) is also provided with a control mechanism (500), the control mechanism (500) contacts the inner wall of the pipeline (400) before the movable flow baffle (300), and the control mechanism (500) can be opened under the contact force action of the inner wall of the pipeline (400) and can be closed under the action of gravity or elasticity when being separated from the inner wall of the pipeline (400), so that the opening or closing state of the movable flow baffle (300) is driven to be switched.

9. An in-line pipeline fluid testing device according to claim 8, wherein: the control mechanism (500) comprises a double-arm structure or a V-shaped spring wire which are connected through a hinge, the movable flow baffle plates (300) are respectively and symmetrically arranged at two sides of the fixed flow baffle plate (202), and two ends of the control mechanism (500) are correspondingly connected to the movable flow baffle plates (300) at the two sides.

10. A direct-insertion type pipeline fluid detection method is characterized by comprising the following steps: the method comprises the following steps:

s1, the movable flow baffle (300) or the control mechanism (500) of the direct-insertion sensor (100) is rotated inwards, so that the movable flow baffle (300) is in a closed state relative to the fixed flow baffle (202);

s2, the direct-insertion type sensor (100) is installed into the pipeline (400) from the installation hole on the pipeline (400) downwards, and the movable flow baffle (300) is parallel to the axial direction of the pipeline (400);

s3, continuously moving the direct-insertion type sensor (100) downwards to enable the lower end of the movable flow baffle (300) or the control mechanism (500) to be in contact with the inner wall of the pipeline (400);

s4, after the lower end of the movable flow baffle (300) or the control mechanism (500) is contacted with the inner wall of the pipeline (400), continuously applying a pushing force downwards to open the movable flow baffle (300);

s5, rotating the direct-insert type sensor (100) to enable the movable flow baffle (300) to be vertical to the axial direction of the pipeline (400), and screwing the direct-insert type sensor (100) to be installed on the pipeline (400) to form a pipeline detection pool;

s6, after the detection is finished, the direct insertion type sensor (100) is moved upwards, the movable flow baffle (300) is gradually closed under the action of gravity or a control mechanism (500), the direct insertion type sensor (100) is continuously lifted upwards, and when the movable flow baffle (300) contacts the edge of the mounting hole in the pipeline (400), the movable flow baffle (300) is completely closed and can be smoothly taken out of the mounting hole in the pipeline (400);

or:

when the direct-insert sensor (100) is only provided with the fixed flow baffle plate (202), the direct-insert sensor (100) is installed to enable the fixed flow baffle plate (202) to be vertical to the axial direction of the pipeline (400), and the direct-insert sensor (100) is screwed to be installed on the pipeline (400), so that a pipeline detection pool is formed; after the detection is finished, the direct-insertion sensor (100) is moved upwards and taken out.

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